Screening-conveyer.



T. E. WEBSTER. SCREENING CONVEYER. APPLICATIQN- man 1AN.'27,'1912.

Patented Jim@ 8,1915.

i 1,142,64a: l

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mnoMAsj-r. W'Ensrnnpor snwIcKLnY, PENNSYLVANIA, nssrenon'mo LINK-'BELT COMPANY, or eHaxcAGo, ILLINfoIs, acoRroI-ATIOI or ILLINOIS.

'SCREENING-convenait.

To all whom t may/lcnoern.'

Be it known. that vI, THOMAS a citizen of the United States, residing at Sewickley, countyof Allegheny, State of Pennsylvania, have invented certain Improvements in Sereenin -Conveyers, of which I the following `is a speci cation.

One object of my invention is to provide means for screening coal and like material as it is conveyed from one point to'anothen A further object of the invention is to rovide a screenin which albucket conveyer 1s used, the screen being so located that the material to be screened will iiowl from the bucket' by gravity over the screen, and the..

particles not passing through the screen will be picked up again by the bucket and convveyed to a .discharge point.

In the accom anying drawing: Figure-1, is a longitudina sectional view of a conveying and screening apparatus illustrating my invention; Fig. 2, is a plan view of a conveying and screening apparatus; and Fig'. 3, yis a view of a modification of the invention.

A is an endless conveyer'consisting of chains a to which are attached buckets b.' These buckets are of the form illustrated in Fig. 1, and are used for.' elevating, as well asf 4 conveying, the material in a horizontal plane 80 d, d are bars which are spaced a given disf tance apaztto form a screen so that as the coal Hows down the portion D of .the trough, the small particles of coal will pass through the screen, While the largerparticles'will e retained by the bars and when they ilow to 4 5 the lower portion of the trough, where it changes angle, the bucket b will pick up the larger' portions of the coal and convey them t0 a discharge point. y i At intervals in the horizontal portion of i. the trough are openings e closed by suitable doorsE so that when one of these doors is open the coal will pass through-the opening and falleither into' the bin directly below it .or be.- guided by troughs t any suitablel l 55 discharge point. The screenings accumulate Specieation of yLetters Patent.

Application `iilel January 27. 1912. A Serial No. 673,708. v.

l'against the .back of Patented June S, '1915.

in the bin directly, under the screen d in the present Instance, although there may be a trougharranged under the screens to carry `the screenings to any point desired.. The

coal or other material is elevated by the'conyeyer from any point as shownin the draw ings, and as-.it passes over the rhead Wheel B it is discharged onto the screen.

InI Fig. 3, I have shownja modification in l which the trough terminates 'at the endl of the'inclined screen portion so that `the ,coal 1s discharged from `the end of thescreen into a suitable bin-I at the point without 'the bucket again picking up the material, as

inrig.1. i.

While I 'prefer to use the particular `form vof bucket illustrated vin Fig. -1, the'shape or. f

design of the-bucketfmay be modified to i meet certain conditions. y

however, be suchjthat-the materi ljcan read. j ily flow therefrornontotheSleeffand can'.-r

he bucket mi/lst,

he picked up againby thli-bucketu'fafterpasslng the screen. The' ang than the angle of repos f the material', so

ebf-lthsreen r'ofrjtion of the trough must 1 all cases be greater the balance of theitro'ugh an Alee-'either horifI zontal, as shown, oriat as i'ght angle, .which will not allow the material to rapidly pile the preceding bucket. Iclaim: 'W

1. The combination, in means for screeny ing coal and like granular material, r'ofa` screen arran ed`on .an incline greater than 'material mayy be wholly discharged from each? bucket at the upperend 'ofthe screen and flow downwardl over the screen in advance of the moving uckets whichlifted-the f same.

2.1 The combination, in means for screenlng coal and llke granular material, of a i the angle o repose lof the material 4being screened, and a continuously moving buck'et trough having a screen portion arranged en an incline greater than the angle of repose` of the material being screened, and a lower portion at a lesser angle, and a continuously moving bucketconveyer 'arrangd'to convey thematerial tothe top of the screen and to travel downwardl fover'the screen whereby f the material may e wholly discharged from each bucket at the upper, end of the screen A and flow over the sereenin advance of the moving buckets which lifted the same; the lower portion of the screen structure serving to retard the flow of the material to allow the buckets to again take up `the screened material and carry it to a discharge point.

In testimony whereof, have signerl my name to this specification, in the presence ef 1' two subscribing Witnesses.

. THOMAS F. WEBSTER. Witnesses:

P. V. WHEEIMR,

THos. JEFFERSON EWELL. 

